Pls., can you add example, how connect IR LED to analog port(e.g. QED123)? Maybe it's the primitive for someone But I'm not sure, how do it (and I think, so I'm not alone here). If is possible, add pls. example, how connect the same LED to a digital port. (I heard that is it possible too). I need it, because is it sanest choice for e.g. linefollower.Thank You.BoNo

Hello rrafko, Life is a learning process. This is not a simple as some may lead you to beleive. First the wiring board works with 0 to 5 DC volts Ranage. depending on your IR LED you have, it may work or not work. I believe you want to use it as a sensor to read another IR LED's reflection from the surface your running on. So you can tell if your sensor is on or off the line. normally you use a minimum of three. the more sensors the better.

I have done some testing with QRB1134 LED/Phototransister. Which is simular. As the light's intencity increaces and decreases the the voltage increases and decreases. It can be hooked up like a Photoresistor in most cases I believe. SEE http://www.wiring.org.co/learning/examples/photoresistor.html

please post a link to the data sheet for the LED sensor you have and I'll give you a good place to start your testing.Placement of the sensor and IR light sorce can greatly effect your readings.

Another Note: By change the cap you can adjust the range9more sensitive and less sensitive. I isaid in my first post there maybe more to it than you would think. Testing and expirmenting is the fun part anyway.

hi there, we were working on the site, still some issues and broken links but lots of new things, check out your diagram here, thank you Vaccumdiode2, http://wiring.org.co/learning/basics/phototransistor.html